These are some recipes that let sims prepare the Maxis cupcakes in their oven, instead of having to use a cupcake machine. You also need to download the updated Custom Food Interactions from this thread in order to have the interactions available.

Some of the cupcakes require a little bit more skill than if you’d use the cupcake machine, so the machine is still good for something. The Carrot Cake and Strawberry Fizzy variants require ingredients (carrots and strawberries). All cupcakes are available from the Serve Dessert and Custom Food menus (both are part of the Custom Food Interactions mod; Serve Dessert is available between 11AM and 2AM); sims can autonomuously make them as well.